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i anm thinking of travelling puerto montt to puerto chacabuco or the other way in December.

It looks as though the ferries leave in the evening. i do not know the time of sunset in the evening but presumabkly the most spectacular part of the trip is approaching or departing puerto chacabuco. so presumably its best to travel from puerto monmtt?

Both port departures are nice, Chacabuco is perhaps more dramatic, you will cruise by a huge landslide from a submerged volcano's activity. Weather will determine if you see much, and there will be light until about 10 pm.